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CK-12 Foundation
Ck 12: Geometry: Rigid Transformations
[Free Registration/Login may be required to access all resource tools.] Identify different types of transformations.
Illustrative Mathematics
Illustrative Mathematics: G Co Seven Circles Ii
In this task, seven pennies are placed in a circle so that they are all touching one in the center and their neighbors. Learners are asked to find as many rigid motions of the plane as they can which are symmetries of this configuration...